袁河流域水环境容量分析的设计水文条件计算

Calculation of Designed Hydrological Conditions for Analyzing Water Environmental Capacity in Yuanhe River Basin

设计水文条件是流域水环境容量分析的重要前提,然而在一些小流域,水文站点相对较少,给设计水文条件计算带来一定难度。本文采用区域化方法,以袁河流域为例,根据其现有的水文站及其毗邻锦江流域水文站的水文资料采用一元线性函数建立了设计流量和集水面积的关系,采用幂指函数Y=aQb分别建立了流量与流速、平均水深及河宽的关系。根据建立的模型对袁河流域各控制断面的设计流量、设计流速、平均水深及河宽进行了计算,从而为水文站较少流域设计水文条件的计算提供了范例。

Designed hydrological condition is important for analyzing water environmental capacity. In some small watersheds, how- ever, there are no enough hydrometric stations, which brings some barriers to the calculation of designed hydrological conditions. As a case study in Yuanhe River Basin, using regionalization method, according to the hydrological data of the existing hydrometrie stations of the basin and its adjacent basin, Jinjiang river basin, the relationship between designed flow Qdrs and catchment area S was fitted using unitary linear function, and the relationship between the flow, flow velocity, mean depth and river width were fitted using power exponent function Y=aQb, respectively. Based on the model established above, the designed flow, designed velocity, mean depth and fiver width at the various control sections of the Yuanhe River Basin were calculated, which provide an instance for calculation of designed hydrological conditions in some small watershed without enough hydrometric stations.